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The milligram (mg) and the gram (g) are both measurements of weight or mass in the metric measurement system. One gram is equal to 1000 milligrams. The milliliter (ml) is a measurement of volume in the metric measurement system. One milliliter is equal to 1 gram; there is a 1:1 ratio between the two units of measure. To convert an amount from milligrams to milliliters, divide the amount by 1000 to convert to grams, and divide the new amount by 1 to convert to milliliters.